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Date: Thu, 18 Feb 2021 19:31:41 +0000
From: Grant Grundler <grundler@...omium.org>
To: Oliver Neukum <oneukum@...e.com>
Cc: netdev <netdev@...r.kernel.org>,
Grant Grundler <grundler@...omium.org>,
Andrew Lunn <andrew@...n.ch>, davem@...emloft.org,
Hayes Wang <hayeswang@...ltek.com>,
Jakub Kicinski <kuba@...nel.org>,
Roland Dreier <roland@...nel.org>
Subject: Re: [PATCHv3 1/3] usbnet: specify naming of usbnet_set/get_link_ksettings
Oliver, Jakub,
Can I post v4 and deal with the issues below?
I can compile and test against ToT for now and I'll like to get this
mess behind me.
I still think the first patch in this series should revert my previous
change (de658a195ee23ca6aaffe197d1d2ea040beea0a2).
On Thu, Feb 18, 2021 at 10:21 AM Oliver Neukum <oneukum@...e.com> wrote:
>
> The old generic functions assume that the devices includes
> an MDIO interface. This is true only for genuine ethernet.
> Devices with a higher level of abstraction or based on different
> technologies do not have it. So in preparation for
> supporting that, we rename the old functions to something specific.
I'd like to propose a rewrite of the commit message:
usbnet: add _mii suffix to usbnet_set/get_link_ksettings
The generic functions assumed devices provided an MDIO interface (accessed
via older mii code, not phylib). This is true only for genuine ethernet.
Devices with a higher level of abstraction or based on different
technologies do not have MDIO. To support this case, first rename
the existing functions with _mii suffix.
> v2: rebased on changed upstream
> v3: changed names to clearly say that this does NOT use phylib
Nit: The v2/v3 lines should be included BELOW the '---' line since
they don't belong in the commit message.
Nit2: V3 folds part of a successive patch into this one. If that was
intentional, the commit message needs further rewrite and the changes
to usbnet.h got lost.
> Signed-off-by : Oliver Neukum <oneukum@...e.com>
> Tested-by: Roland Dreier <roland@...nel.org>
> ---
> drivers/net/usb/asix_devices.c | 12 ++++++------
> drivers/net/usb/cdc_ncm.c | 4 ++--
> drivers/net/usb/dm9601.c | 4 ++--
> drivers/net/usb/mcs7830.c | 4 ++--
> drivers/net/usb/sierra_net.c | 4 ++--
> drivers/net/usb/smsc75xx.c | 4 ++--
> drivers/net/usb/sr9700.c | 4 ++--
> drivers/net/usb/sr9800.c | 4 ++--
> drivers/net/usb/usbnet.c | 36 ++++++++++++++++++++++++++++------
> include/linux/usb/usbnet.h | 6 ++++--
> 10 files changed, 54 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
> index 6e13d8165852..19a8fafb8f04 100644
> --- a/drivers/net/usb/asix_devices.c
> +++ b/drivers/net/usb/asix_devices.c
> @@ -125,8 +125,8 @@ static const struct ethtool_ops ax88172_ethtool_ops = {
> .get_eeprom = asix_get_eeprom,
> .set_eeprom = asix_set_eeprom,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static void ax88172_set_multicast(struct net_device *net)
> @@ -291,8 +291,8 @@ static const struct ethtool_ops ax88772_ethtool_ops = {
> .get_eeprom = asix_get_eeprom,
> .set_eeprom = asix_set_eeprom,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static int ax88772_link_reset(struct usbnet *dev)
> @@ -782,8 +782,8 @@ static const struct ethtool_ops ax88178_ethtool_ops = {
> .get_eeprom = asix_get_eeprom,
> .set_eeprom = asix_set_eeprom,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static int marvell_phy_init(struct usbnet *dev)
> diff --git a/drivers/net/usb/cdc_ncm.c b/drivers/net/usb/cdc_ncm.c
> index 4087c9e33781..0d26cbeb6e04 100644
> --- a/drivers/net/usb/cdc_ncm.c
> +++ b/drivers/net/usb/cdc_ncm.c
> @@ -142,8 +142,8 @@ static const struct ethtool_ops cdc_ncm_ethtool_ops = {
> .get_sset_count = cdc_ncm_get_sset_count,
> .get_strings = cdc_ncm_get_strings,
> .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_internal,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
> diff --git a/drivers/net/usb/dm9601.c b/drivers/net/usb/dm9601.c
> index b5d2ac55a874..89cc61d7a675 100644
> --- a/drivers/net/usb/dm9601.c
> +++ b/drivers/net/usb/dm9601.c
> @@ -282,8 +282,8 @@ static const struct ethtool_ops dm9601_ethtool_ops = {
> .get_eeprom_len = dm9601_get_eeprom_len,
> .get_eeprom = dm9601_get_eeprom,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static void dm9601_set_multicast(struct net_device *net)
> diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
> index fc512b780d15..9f9352a4522f 100644
> --- a/drivers/net/usb/mcs7830.c
> +++ b/drivers/net/usb/mcs7830.c
> @@ -452,8 +452,8 @@ static const struct ethtool_ops mcs7830_ethtool_ops = {
> .get_msglevel = usbnet_get_msglevel,
> .set_msglevel = usbnet_set_msglevel,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static const struct net_device_ops mcs7830_netdev_ops = {
> diff --git a/drivers/net/usb/sierra_net.c b/drivers/net/usb/sierra_net.c
> index 55a244eca5ca..55025202dc4f 100644
> --- a/drivers/net/usb/sierra_net.c
> +++ b/drivers/net/usb/sierra_net.c
> @@ -629,8 +629,8 @@ static const struct ethtool_ops sierra_net_ethtool_ops = {
> .get_msglevel = usbnet_get_msglevel,
> .set_msglevel = usbnet_set_msglevel,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static int sierra_net_get_fw_attr(struct usbnet *dev, u16 *datap)
> diff --git a/drivers/net/usb/smsc75xx.c b/drivers/net/usb/smsc75xx.c
> index 4353b370249f..f8cdabb9ef5a 100644
> --- a/drivers/net/usb/smsc75xx.c
> +++ b/drivers/net/usb/smsc75xx.c
> @@ -741,8 +741,8 @@ static const struct ethtool_ops smsc75xx_ethtool_ops = {
> .set_eeprom = smsc75xx_ethtool_set_eeprom,
> .get_wol = smsc75xx_ethtool_get_wol,
> .set_wol = smsc75xx_ethtool_set_wol,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static int smsc75xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
> diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c
> index 878557ad03ad..ce29261263cd 100644
> --- a/drivers/net/usb/sr9700.c
> +++ b/drivers/net/usb/sr9700.c
> @@ -250,8 +250,8 @@ static const struct ethtool_ops sr9700_ethtool_ops = {
> .get_eeprom_len = sr9700_get_eeprom_len,
> .get_eeprom = sr9700_get_eeprom,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static void sr9700_set_multicast(struct net_device *netdev)
> diff --git a/drivers/net/usb/sr9800.c b/drivers/net/usb/sr9800.c
> index da56735d7755..a822d81310d5 100644
> --- a/drivers/net/usb/sr9800.c
> +++ b/drivers/net/usb/sr9800.c
> @@ -527,8 +527,8 @@ static const struct ethtool_ops sr9800_ethtool_ops = {
> .get_eeprom_len = sr_get_eeprom_len,
> .get_eeprom = sr_get_eeprom,
> .nway_reset = usbnet_nway_reset,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> static int sr9800_link_reset(struct usbnet *dev)
> diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c
> index b4c8080e6f87..f3e5ad9befd0 100644
> --- a/drivers/net/usb/usbnet.c
> +++ b/drivers/net/usb/usbnet.c
> @@ -944,7 +944,10 @@ EXPORT_SYMBOL_GPL(usbnet_open);
> * they'll probably want to use this base set.
> */
>
> -int usbnet_get_link_ksettings(struct net_device *net,
> +/* These methods are written on the assumption that the device
> + * uses MII
> + */
> +int usbnet_get_link_ksettings_mii(struct net_device *net,
> struct ethtool_link_ksettings *cmd)
> {
> struct usbnet *dev = netdev_priv(net);
> @@ -956,9 +959,30 @@ int usbnet_get_link_ksettings(struct net_device *net,
>
> return 0;
> }
> -EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings);
> +EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_mii);
> +
> +int usbnet_get_link_ksettings_internal(struct net_device *net,
> + struct ethtool_link_ksettings *cmd)
> +{
> + struct usbnet *dev = netdev_priv(net);
> +
> + /* the assumption that speed is equal on tx and rx
> + * is deeply engrained into the networking layer.
> + * For wireless stuff it is not true.
> + * We assume that rxspeed matters more.
> + */
> + if (dev->rxspeed != SPEED_UNKNOWN)
rxspeed doesn't exist yet - that was part of the successive patch
(added to usbnet.h)
cheers,
grant
> + cmd->base.speed = dev->rxspeed / 1000000;
> + else if (dev->txspeed != SPEED_UNKNOWN)
> + cmd->base.speed = dev->txspeed / 1000000;
> + else
> + cmd->base.speed = SPEED_UNKNOWN;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(usbnet_get_link_ksettings_internal);
>
> -int usbnet_set_link_ksettings(struct net_device *net,
> +int usbnet_set_link_ksettings_mii(struct net_device *net,
> const struct ethtool_link_ksettings *cmd)
> {
> struct usbnet *dev = netdev_priv(net);
> @@ -978,7 +1002,7 @@ int usbnet_set_link_ksettings(struct net_device *net,
>
> return retval;
> }
> -EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings);
> +EXPORT_SYMBOL_GPL(usbnet_set_link_ksettings_mii);
>
> u32 usbnet_get_link (struct net_device *net)
> {
> @@ -1043,8 +1067,8 @@ static const struct ethtool_ops usbnet_ethtool_ops = {
> .get_msglevel = usbnet_get_msglevel,
> .set_msglevel = usbnet_set_msglevel,
> .get_ts_info = ethtool_op_get_ts_info,
> - .get_link_ksettings = usbnet_get_link_ksettings,
> - .set_link_ksettings = usbnet_set_link_ksettings,
> + .get_link_ksettings = usbnet_get_link_ksettings_mii,
> + .set_link_ksettings = usbnet_set_link_ksettings_mii,
> };
>
> /*-------------------------------------------------------------------------*/
> diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
> index cfbfd6fe01df..132c1b5e14bb 100644
> --- a/include/linux/usb/usbnet.h
> +++ b/include/linux/usb/usbnet.h
> @@ -267,9 +267,11 @@ extern void usbnet_pause_rx(struct usbnet *);
> extern void usbnet_resume_rx(struct usbnet *);
> extern void usbnet_purge_paused_rxq(struct usbnet *);
>
> -extern int usbnet_get_link_ksettings(struct net_device *net,
> +extern int usbnet_get_link_ksettings_mii(struct net_device *net,
> struct ethtool_link_ksettings *cmd);
> -extern int usbnet_set_link_ksettings(struct net_device *net,
> +extern int usbnet_get_link_ksettings_internal(struct net_device *net,
> + struct ethtool_link_ksettings *cmd);
> +extern int usbnet_set_link_ksettings_mii(struct net_device *net,
> const struct ethtool_link_ksettings *cmd);
> extern u32 usbnet_get_link(struct net_device *net);
> extern u32 usbnet_get_msglevel(struct net_device *);
> --
> 2.26.2
>
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